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Air carrier X descent through occupied altitude had less than standard separation from military Y. System error.
| Attributes | |
| ACN | 243604 |
| Time | |
| Date | 199306 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : mdl |
| State Reference | VA |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : ckb |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors enroute airway : zdc |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 3 |
| ASRS Report | 243604 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : flight data |
| Qualification | controller : developmental controller : non radar |
| ASRS Report | 243698 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 28800 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was descending to 7000. Military Y was level at 10000. Air carrier X was turned 20 degrees right to miss military Y. Military Y was turned right but did not respond to 2 clrncs. Supplemental information from acn 243698: air carrier X was nebound descending into cho, military Y was swbound sdz at 10000. Right side turned air carrier X right away from military Y for descent. When he recognized they would be tight he attempted to turn military Y. Military Y did not respond and lateral separation was lost.
Original NASA ASRS Text
Title: ACR X DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM MIL Y. SYS ERROR.
Narrative: ACR X WAS DSNDING TO 7000. MIL Y WAS LEVEL AT 10000. ACR X WAS TURNED 20 DEGS R TO MISS MIL Y. MIL Y WAS TURNED R BUT DID NOT RESPOND TO 2 CLRNCS. SUPPLEMENTAL INFO FROM ACN 243698: ACR X WAS NEBOUND DSNDING INTO CHO, MIL Y WAS SWBOUND SDZ AT 10000. R SIDE TURNED ACR X RIGHT AWAY FROM MIL Y FOR DSCNT. WHEN HE RECOGNIZED THEY WOULD BE TIGHT HE ATTEMPTED TO TURN MIL Y. MIL Y DID NOT RESPOND AND LATERAL SEPARATION WAS LOST.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.